Question

why chemist used and choose carbon atom for relative atomic mass to compared with another atom?​

Answer 1

Answer:

Different atoms have different masses. Atoms have such a small mass it is more convenient to know their masses compared to each other. Carbon is taken as the standard atom and has a relative atomic mass (A r) of 12. Atoms with an A r of less than this have a smaller mass than a carbon atom.

Answer 2

$\bf\mathtt\red{Answer:-}$

1. The mass of a carbon atom is the default for finding R.M.M
2. Answer is always accurate when using mass of C-12 atom